E-4 Vipersat CDD-564L User’s Guide
Group ID A number assigned to equipment which defines it as a member of a group when
addressed by the burst controller.
GUI Graphical User Interface – A form of graphical shell or user interface to a
computer operating system.
H
HDLC High Level Data Link Control – A standard defining how data may be transmit-
ted down a synchronous serial link.
HPA High Power Amplifier – The amplifier used in satellite communications to raise
the transmit signal to the correct power level prior to transmission to satellite.
See also SSPA.
HTTP Hyper Text Transfer Protocol – The Internet standard for World Wide Web
(WWW) operation.
Hub The central site of a network which links to a number of satellite earth sites.
I
ICMP Internet Control Message Protocol.
Installation
Wizard
A program which guides the user through the process of installing an applica-
tion.
IF Intermediate Frequency – In satellite systems, IF frequencies are usually
centered around 1200 MHz (L-band), or 70 MHz (video/TV).
IP Internet Protocol – A format for data packets used on networks accessing the
Internet.
ISP Internet Service Provider – A company providing Internet access.
ITU International Telecommunications Union.